Choose the reading
A handheld meter gives you a way to judge light without relying on the camera’s built in meter. Before taking a reading, set the meter to the speed printed on the film carton, then choose whether to measure light falling on the subject or light reflected from it. An incident reading measures the illumination itself; a reflected reading measures the brightness of whatever you point the meter at. The distinction matters when a pale wall, dark coat, or bright sky fills much of the view.
Set the meter to match the camera’s settings, and make sure its units are useful to you. Most meters display a combination of lens opening and exposure time; some let you hold one constant while finding the other. If the camera’s dial uses different markings, check the manual before heading out. A reading is only helpful if you can transfer it accurately. I like to check the meter and camera side by side before leaving home, especially when I have not used that meter recently.
Take an incident reading
For an incident reading, stand where the subject is and point the meter’s white dome toward the camera. Keep your hand and clothing from shading it. Outdoors, this gives a dependable starting point for a person or object in open light. If the subject is lit strongly from one side, take another reading with the dome turned toward the main light. The difference tells you how uneven the illumination is, which can help you decide whether you want deep shadows or more detail on the shaded side.
Indoors, put the dome at the subject’s position rather than measuring from across the room. If a person is sitting by a window, hold the meter near their face and point it toward the camera. Take care not to block the window with your body. A reading from your seat may be misleading if you are several feet away or under a different lamp. When moving the meter is impractical, use a neutral card at the subject’s position and take a reflected reading from it.
Read the scene
A reflected meter tries to render the area it sees as a middle brightness. Aim it at a dark coat and it may recommend more exposure than the coat needs; aim it at snow and it may suggest too little. With a spot meter, take a reading from a tone you know should look ordinary, or compare several parts of the scene. A bright wall, for example… can give a misleading result if it fills the meter’s view. A slide projector in a dim room makes a useful reminder that apparent brightness depends on surroundings, so judge the scene with a reading rather than your eyes alone.
When contrast is high, meter the important areas separately. If the shadow reading and the bright reading differ by several stops, decide which detail matters most and set exposure accordingly. The rangefinder patch can help you bring a subject into focus, but it cannot tell you how much brighter that subject is than its background. A handheld meter answers a different question. Keep the camera aimed and focused as intended, then take readings from the areas that will determine the photograph’s appearance.
Check and keep notes
Treat the number as a recommendation, not an order. If your meter suggests a setting that would leave a face in deep shade, open the lens or give a longer exposure to preserve more detail. For a bright subject against a dark background, consider whether you want the subject’s texture or the surrounding shadows to guide your choice. The meter is giving a recommendation — you still decide what the photograph should retain. A small exposure log can make later darkroom printing comparisons less mysterious, especially when you note the light and the setting used.
Check that the meter’s battery is fresh, and carry a spare if the model uses an uncommon size. Compare its reading with a known gray card in steady daylight once in a while; a large difference may point to a setting error or a meter that needs attention. Write down the light, meter mode, and camera setting when a scene is tricky. A short note such as “open shade, dome toward camera” is enough to make the result understandable later. After a few outings, the routine becomes quick, and the meter helps you make deliberate choices instead of guessing.
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